81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
/* Copyright notice for this file:
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* Copyright (C) 2018
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* This mapper was added by retrowertz for Libretro port of QuickNES.
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*
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* Mapper 180 Crazy Climber
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*
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*/
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#include "Nes_Mapper.h"
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template < bool _is152 >
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class Mapper_74x161x162x32 : public Nes_Mapper {
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public:
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Mapper_74x161x162x32()
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{
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register_state( &bank, 1 );
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}
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virtual void reset_state()
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{
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if ( _is152 == 0 )
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bank = ~0;
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}
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virtual void apply_mapping()
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{
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if ( _is152 )
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write( 0, 0, bank );
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else
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{
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intercept_writes( 0x6000, 1 );
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write_intercepted( 0, 0x6000, bank );
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}
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}
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virtual bool write_intercepted( nes_time_t, nes_addr_t addr, int data )
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{
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if ( ( addr != 0x6000 ) || _is152 )
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return false;
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bank = data;
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set_prg_bank( 0x8000, bank_32k, ( bank >> 4 ) & 0x03 );
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set_chr_bank( 0x0000, bank_8k, ( ( bank >> 4 ) & 0x04 ) | ( bank & 0x03 ) );
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return true;
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}
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virtual void write( nes_time_t, nes_addr_t addr, int data )
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{
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if ( _is152 == 0) return;
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bank = handle_bus_conflict (addr, data );
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set_prg_bank( 0x8000, bank_16k, ( bank >> 4 ) & 0x07 );
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set_chr_bank( 0x0000, bank_8k, bank & 0x0F );
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mirror_single( ( bank >> 7) & 0x01 );
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}
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uint8_t bank;
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};
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void register_mapper_70();
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void register_mapper_70()
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{
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register_mapper< Mapper_74x161x162x32 <true> > ( 70 );
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}
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